Meanwhile the Prince, when his explorations (from 1441) first began to promise important results, obtained from Pope Eugenius IV a plenary indulgence to those who shared in the war against the Moors consequent on the new discoveries,[22] and from the Regent D. Pedro he also gained a donation of the Royal Fifth on the profits accruing from the new lands, as well as the sole right of permitting voyages to these parts. The Infant's work, was moreover, recognised in bulls of Nicholas V (1455) and of Calixtus III (March 13th, 1456). In earlier life--apparently soon after the capture of Ceuta and the embassy of Manuel Palæologus asking for help against the Turks--he had been invited, Azurara tells us, by a predecessor[23] of the Pontiffs above-named to take command of the "Apostolic armies," and similar invitations reached him from the Emperor of Germany,[24] the King of England (Henry V or VI)[25] and the King of Castille.[26] We may also briefly notice in this place, referring to a later page for a more detailed treatment of the subject, that the Infant, in 1445 and 1446, repeated his earlier attempts (in 1424 and 1425) to secure the Canaries for Portugal, both by means of purchase and of armed force; and that, from 1444-5 especially, he colonised, as well as discovered, and traded with increased energy in the Madeira Group, the Azores, and (if his experiment at Arguim in 1448 may stand as an example) even on the mainland coast of Africa. [Footnote 22: Barros and Galvano make Prince Henry obtain Indulgences from Pope Martin [V, who reigned 1417-31] in 1441-2, by the embassy of Fernam Lopez d'Azevedo (see p. xv).] [Footnote 23: Martin V?] [Footnote 24: Sigismund?] [Footnote 25: Henry VI made the Infant a Knight of the Garter, and is more likely than the conquering Henry V to have asked a foreign Prince to aid him against the French.] [Footnote 26: John II.]